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computer-playbook/roles/sys-systemctl
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README.md

sys-systemctl

Utility role to reset/clean up systemd units for a given software stack.
It can install a unit-file remover tool, delete units that match a configured suffix, and reload the systemd daemon. The role is designed to run once per play and is commonly included by other roles (e.g., timer/service roles) to ensure a clean state before (re)deployment.

Overview

When MODE_RESET is enabled, the role will:

  1. Install the configured remover tool/package (via pkgmgr-install).
  2. Remove all unit files that match the configured suffix for the current software.
  3. Reload the systemd daemon to apply changes.

A run-once guard (run_once_sys_systemctl) prevents repeated execution within the same play run.

Features

  • Idempotent cleanup of systemd unit files based on a suffix.
  • Pluggable remover tool via UNIT_SUFFIX_REMOVER_PACKAGE.
  • Daemon reload to immediately apply changes.
  • Run-once safety across the play to avoid redundant work.

Variables

Variable Type Default Description
MODE_RESET bool false If true, executes the reset/cleanup tasks.
SYS_SERVICE_SUFFIX string required Suffix used to identify unit files belonging to the software stack (e.g., .infinito.nexus).
SOFTWARE_NAME string required Logical software identifier passed to the remover tool.
UNIT_SUFFIX_REMOVER_PACKAGE string "unsure" Package/command used to remove the unit files. Must provide a CLI compatible with -s.

Note: The role expects the remover tool to support a command pattern like:

<UNIT_SUFFIX_REMOVER_PACKAGE> -s '<SOFTWARE_NAME>'

Replace UNIT_SUFFIX_REMOVER_PACKAGE with your actual utility (or wrapper script) that removes all matching unit files.

Tasks Flow

  • tasks/main.yml

    • Includes tasks/01_reset.yml only when MODE_RESET is true.
    • Loads utils/run_once.yml once to set run_once_sys_systemctl.

  • tasks/01_reset.yml

    • Installs UNIT_SUFFIX_REMOVER_PACKAGE via pkgmgr-install.
    • Executes the remover command to purge unit files for SOFTWARE_NAME / SYS_SERVICE_SUFFIX.
    • Runs systemctl daemon-reload.

Dependencies

  • pkgmgr-install (role): used to install UNIT_SUFFIX_REMOVER_PACKAGE.